Stove-burner.



G. D. BRADSHAW.

STOVE BURNER. APPLICATioN FILED JULY15. 1915.l

Patented 001;. 26, 191" aff/ff Wl fil/8858 pasaran asrarne parental orar-aren.

GRANT D BRADSHAW, F WEST-MONT BOROUGH, PENNSYLVANIA.

eToys-BURNER.

'application filed .my i5, 1915i serial No. 39,9455.

To all whom t 'may concern Be it known that l, GRANT D. BRADSHAM:

a citizen of the United States, residing in the `borough of Westmont, in the county off Cambria and State of Pennsylvania, whose post-oilice address is Johnstown, PennsyL vania,have invented certain new and useful improvements in StoveBurners; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

` My. invention consists generally of a burner adapted to permit the' combustion of combustible gas or gases and air'and is particularly adapted for use in what is known l'as hot-blast stoves, although it may be used on heating furnaces, boiler furnaces or for anypurpose where heat is required. My stove .burner 1s also especially adapted for thoroughly mixing and'aiding the combuserable radius, in order to` insure a uniform.

flow of gases therethrough, in which tube I mount a construction whereby the area vthereof 1s restricted and the gas velocity 1s consequentlymade greater in. its vicinity.

From the point of the greatest size of this obstructionl taper it down to a comparatively sharp point near the exit end of the tube; thus giving` the effect lat the outer end `of an expanding or increasing section and reducinglthe friction and eddying losses to a minimum. At the point of the greatest contraction of thev tube, due tothe obstruction placed therein andnear the point of the highest velocity of the `pgase I provide within the obstruction, which is hollow, a number of openings, which are connected to the' external or other sources of air supply by a tube or pipe oit' smaller size than 'the main gaspipe. By reason of this eonstrucffv tion, the total head at the burner outlet composed of two items; namely, the static Specification of Letters llatent. l ,Watan-t6@ oet. se, lara-l .head and the velocity head, andas the' strney 'in question contains gases at or about' at-'- mospheric, pressure, the tot-al head is the velocity head alone. At the point of highest velocity in the burner the total head, due.

to the absence of losses by reason of the eX- y -panded cone construction, is equal to the total head at the outlet end of the burner.A

Ans, however, thewelocity head at the point oi greatest velocity isigreater than the Veloclty head at the outlet end of the burner,

traction must` be negative, or a. minimum quantity and consequently if opportunity isgiven for the external air to enter this point it will do so, and it will be drawn l` into the burner at a velocity proportional to the'square root of this-negative head'. i s the square root of this negative, headis als proportionaltothe gas Velocity,"i t naturally follows that the 2las and air yelocity'lwill also be proportional to each other, vwhereby the result of my construction, is accomp lished, and consequently the mixture of anl and'gasautomatically regulates itself, so that the combustion 'is perfect notwiththe static head at the point of greatest coni standing,V a wide variation or range in the y velocitv or pressureof the gases which are supplied to the burner. rlfhe 'openings in the outer gas burner tube may be consid.

ered as auxiliary and are provided for the purpose of giving a greater area for the inlet of'air with the combustible lgases in the burner, asin some instances these additional exterior openings are needed for the rea-son that on. account of the comparatively small size of my interior air inlet pipe the burner must have enough area of air openings'at or near the contracted portion, so that this air. shall be supplied in vvaccordance. with: my inyention.

Hav-ing thus given a general description .of my apparatus and its mode 'of operation, l will now, in order to make the matter more clear, refer. to the annexed sheet of drawings, which form part of these specifications .and in which like charactersdenote like parts.

Figure 1 is ayertieal cross sectional elevation through my burner and through' the opening in the wall oit' a furnace or hot-blast stove, Fig. Q is .an end elevation ot my; Y

burner looking toward the outlet or discharge end thereof and Fig. 3 illustrates the l air damper which isY used in connection with lmy air supply, but` ll wish it. understood style ofv damper 5 by setting the flanged sleeve 6 .to expose be.used with equally good results.

felice.onfthedravviugg 1 indicates the wall of annularjspacefbetweenthe 4burner and the,

'the`.furnace1orstot{e wall, 5 are fiumi-,lia'I "y.` airopenings lin the external v'f the "size4 off'vvhich may be vreadily adaptedto f-loosfelyjit 'over the 'burner pipe rd an, bef- 'slidback'ward `or forward to i Sethefopenijngs 15. more yor less as provide'ainain air-inlet pipe of 11e azen-marche'gsibumr Pipe which* ai apaisant-.atadas '9 and' passies' through theopeiiing 7in=thegashl1rner pipe and 8 is aaai-1d. th. @dei which 11.15 *of Smau size 3 0 'ora's-ofti" cated cone-section, as indicated atflE, and :isalsoprovided with the Yair openjings 113 --adaptedftof. communicate with the 31.5- 'interiorfof thegas bu'rner 3;-in one direction an Iwitlrthe'-fextei'nal air from the main air.

i f felrng-{nowto the characters of referfurnaeforhot-blast stove, 2 is the -gasv le;l 'f4 2; "the :flange Y. surrounding the 1 more or less of the said openings 5 in order to insure the mostperfect mixture and combustion of gas and air. In order to obtain a thorough and proper mixture of the gases I regulate the slide damper 15 and the sleeve damper s0 that the lcombustible gases passilig through the-burner pipe 3 arethoroughly mixed with air just before they enter ythe combustion chamber 2.

Although I have shown and described my invention in considerable detail, I do not Wish to be limited to the exact and specific' details `shown and described, butmay use -such substitutions, modifications or equivathe sijn space between pipes 9 and lents'zthereof, as arel embraced within th` scope of my invention or as pointed-out in` the claims. j

Having'thus described my invention, what I claim and desire to secure by Letters Patentis:

1. A` gas burner comprising 'a burner tube, an inclined or flaring obstruction located near the exit end'thereof, whereby the cross-sectional area is gradually reduced, said obstructlon then tapering inwardly whereby the cross-section is gradually `increased, air inlet openings near the reduced 9 "in the other direction. At the` outer:

in.the!groovesthereof,'- I provide a slidingl damper-'15," wfherebythe amount of lair. en

portion of said cross-section and means for regulating the size of said openings.

2. A ga's burner comprising a burner tubefaplurality of openings near the exit end thereof, an air inlet tube projecting into said burner tube and increasing in diameter toward `the exit end and then decreasing in size toward said exit end, whereby the area ofsaid burner tube is first contracted and then expanded toward its exit opening; inlets in-the air inlet tube, and means for convtrolling the size of the air inlets aforesaid.

. 3. A gas burner comprising a burner j-teringinto pipe] 9 mayflbe regulatedorl out. i

offe'ntirelyif desired lIn order ,that my apparatus shalll v vork to' theA bestv 'advantage tube, provided with a series of openings near the exit end thereof, a. slide ring damper ,count fo'f their varying I composition, require f {differ-ent amounts of air. -f'or combustion, I

.stantially the correct amountgof air to be account ofthe 5 central location of the outlets 13:0the main airinlet pipe' 9,- these added through theauxiliary air openings 5,

and-.under these conditions the flanged sleeve :somefair throughthe auxiliary lair openings -'cagata' oraiigiiatntaiay-b attained for 'tainable by actual operation, I may` admit adapted to control the size of said openings,

an airfinlet tube projecting yinto the gas lburner .tube aforesaid-and provided on its' outer end with. air regulating means, said inlet tube increasing indiameter and thenable range of pressure of entering gases.

'In testimony whereof I hereunto aiiix my signature in the presence of two witnesses.

GRANT D. BRADSHAW.

vWitnesses:

F. A. STAHL, L. A. Snrrz, Jr.

vecents each, Iby addressing..the Commissioner cit-Patents,

Washington, D. C. 

